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Finding the Fourth Proportional to 20,202.75, 27,879.80 and 13,141.17

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Solution

The fourth proportional to 20,202.75, 27,879.80 and 13,141.17 is: 18,134.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,202.75 : 27,879.80 = 13,141.17 : x
  2. Step 2: Convert to fraction form
    20,202.75/27,879.80 = 13,141.17/x
  3. Step 3: Cross multiply
    20,202.75x = 27,879.80 × 13,141.17
  4. Step 4: Simplify right side
    20,202.75x = 366,373,125.66
  5. Step 5: Solve for x
    x = 366,373,125.66/20,202.75
  6. Step 6: Final answer
    x = 18,134.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.